When a high-profile activist doctor is murdered in his home, Bill is not surprised when Virginia assigns him the investigation. However he is surprised when she tells him to take Charlie Coustas with him as he had been led to believe that Charlie was a temporary attachment and isn't pleased at the growing sense of permanence. Investigating the murder brings Bill back into contact with his estranged sister, Kate, who he has not spoken to for five years. Meanwhile, Maxine asks for Charlie's help with a 10-year-old client facing charges in connection with her latest crimes, a situation to which she is entirely indifferent.